A zeta potential value determines the aggregate’s size of penta-substituted [60]fullerene derivatives in aqueous suspension whereas positive charge is required for toxicity against bacterial cells

Journal of Nanobiotechnology

Ekaterina E Khakina³  Alexander V Zhilenkov³  Pavel A Troshin³  Elena A Sizova²  Evgeniya V Saidakova⁴  Alexey S Vasilchenko⁵  Ludmila V Efremova²  Dmitry G Deryabin¹ 

[1]Department of Microbiology, Orenburg State University, Orenburg, Russia

[2]All-Russia Research Institute of Beef Cattle Breeding, RAS, Orenburg, Russia

[3]Institute for Problems of Chemical Physics of RAS, Chernogolovka, Russia

[4]Institute for Ecology and Genetics of Microorganisms, RAS, Perm, Russia

[5]Institute of Cellular and Intracellular Symbiosis, RAS, Orenburg, Russia

关键词: Toxicity;    Atomic force microscopy;    Bioluminescence inhibition assay;    Photobacterium phosphoreum;    Escherichia coli;    Zeta potential;    Particle size;    Aqueous suspension;    [60]fullerene derivatives;   

Others  :  1224847
DOI  :  10.1186/s12951-015-0112-6

 received in 2015-04-07, accepted in 2015-07-29,  发布年份 2015

【 摘 要 】

Background

The cause–effect relationships between physicochemical properties of amphiphilic [60]fullerene derivatives and their toxicity against bacterial cells have not yet been clarified. In this study, we report how the differences in the chemical structure of organic addends in 10 originally synthesized penta-substituted [60]fullerene derivatives modulate their zeta potential and aggregate’s size in salt-free and salt-added aqueous suspensions as well as how these physicochemical characteristics affect the bioenergetics of freshwater Escherichia coli and marine Photobacterium phosphoreum bacteria. Dynamic light scattering, laser Doppler micro-electrophoresis, agarose gel electrophoresis, atomic force microscopy, and bioluminescence inhibition assay were used to characterize the fullerene aggregation behavior in aqueous solution and their interaction with the bacterial cell surface, following zeta potential changes and toxic effects.

Results

Dynamic light scattering results indicated the formation of self-assembled [60]fullerene aggregates in aqueous suspensions. The measurement of the zeta potential of the particles revealed that they have different surface charges. The relationship between these physicochemical characteristics was presented as an exponential regression that correctly described the dependence of the aggregate’s size of penta-substituted [60]fullerene derivatives in salt-free aqueous suspension from zeta potential value. The prevalence of DLVO-related effects was shown in salt-added aqueous suspension that decreased zeta potential values and affected the aggregation of [60]fullerene derivatives expressed differently for individual compounds. A bioluminescence inhibition assay demonstrated that the toxic effect of [60]fullerene derivatives against E. coli cells was strictly determined by their positive zeta potential charge value being weakened against P. phosphoreum cells in an aquatic system of high salinity. Atomic force microscopy data suggested that the activity of positively charged [60]fullerene derivatives against bacterial cells required their direct interaction. The following zeta potential inversion on the bacterial cells surface was observed as an early stage of toxicity mechanism that violates the membrane-associated energetic functions.

Conclusions

The novel data about interrelations between physicochemical parameters and toxic properties of amphiphilic [60]fullerene derivatives make possible predicting their behavior in aquatic environment and their activity against bacterial cells.

【 授权许可】

   
2015 Deryabin et al.

【 图 表 】

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